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173 lines
5.4 KiB
173 lines
5.4 KiB
#if MYSQL_6_9
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// Copyright ?2004, 2013, Oracle and/or its affiliates. All rights reserved.
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//
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// MySQL Connector/NET is licensed under the terms of the GPLv2
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// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
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// MySQL Connectors. There are special exceptions to the terms and
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// conditions of the GPLv2 as it is applied to this software, see the
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// FLOSS License Exception
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// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published
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// by the Free Software Foundation; version 2 of the License.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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using System;
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using System.Collections;
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using System.Data;
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using System.Collections.Generic;
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using Externals.MySql.Data.MySqlClient.Properties;
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using System.Diagnostics;
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using System.Text;
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using System.Globalization;
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namespace Externals.MySql.Data.MySqlClient
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{
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internal class ProcedureCacheEntry
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{
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public MySqlSchemaCollection procedure;
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public MySqlSchemaCollection parameters;
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}
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internal class ProcedureCache
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{
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private Dictionary<int, ProcedureCacheEntry> procHash;
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private Queue<int> hashQueue;
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private int maxSize;
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public ProcedureCache(int size)
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{
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maxSize = size;
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hashQueue = new Queue<int>(maxSize);
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procHash = new Dictionary<int, ProcedureCacheEntry>(maxSize);
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}
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public ProcedureCacheEntry GetProcedure(MySqlConnection conn, string spName, string cacheKey)
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{
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ProcedureCacheEntry proc = null;
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if (cacheKey != null)
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{
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int hash = cacheKey.GetHashCode();
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lock (procHash)
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{
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procHash.TryGetValue(hash, out proc);
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}
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}
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if (proc == null)
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{
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proc = AddNew(conn, spName);
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conn.PerfMonitor.AddHardProcedureQuery();
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if (conn.Settings.Logging)
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MySqlTrace.LogInformation(conn.ServerThread,
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String.Format(Resources.HardProcQuery, spName));
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}
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else
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{
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conn.PerfMonitor.AddSoftProcedureQuery();
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if (conn.Settings.Logging)
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MySqlTrace.LogInformation(conn.ServerThread,
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String.Format(Resources.SoftProcQuery, spName));
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}
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return proc;
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}
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internal string GetCacheKey(string spName, ProcedureCacheEntry proc)
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{
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string retValue = String.Empty;
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StringBuilder key = new StringBuilder(spName);
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key.Append("(");
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string delimiter = "";
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if (proc.parameters != null)
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{
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foreach (MySqlSchemaRow row in proc.parameters.Rows)
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{
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if (row["ORDINAL_POSITION"].Equals(0))
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retValue = "?=";
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else
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{
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key.AppendFormat(CultureInfo.InvariantCulture, "{0}?", delimiter);
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delimiter = ",";
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}
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}
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}
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key.Append(")");
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return retValue + key.ToString();
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}
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private ProcedureCacheEntry AddNew(MySqlConnection connection, string spName)
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{
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ProcedureCacheEntry procData = GetProcData(connection, spName);
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if (maxSize > 0)
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{
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string cacheKey = GetCacheKey(spName, procData);
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int hash = cacheKey.GetHashCode();
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lock (procHash)
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{
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if (procHash.Keys.Count >= maxSize)
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TrimHash();
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if (!procHash.ContainsKey(hash))
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{
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procHash[hash] = procData;
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hashQueue.Enqueue(hash);
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}
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}
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}
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return procData;
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}
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private void TrimHash()
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{
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int oldestHash = hashQueue.Dequeue();
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procHash.Remove(oldestHash);
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}
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private static ProcedureCacheEntry GetProcData(MySqlConnection connection, string spName)
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{
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string schema = String.Empty;
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string name = spName;
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int dotIndex = spName.IndexOf(".");
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if (dotIndex != -1)
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{
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schema = spName.Substring(0, dotIndex);
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name = spName.Substring(dotIndex + 1, spName.Length - dotIndex - 1);
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}
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string[] restrictions = new string[4];
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restrictions[1] = schema.Length > 0 ? schema : connection.CurrentDatabase();
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restrictions[2] = name;
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MySqlSchemaCollection proc = connection.GetSchemaCollection("procedures", restrictions);
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if (proc.Rows.Count > 1)
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throw new MySqlException(Resources.ProcAndFuncSameName);
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if (proc.Rows.Count == 0)
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throw new MySqlException(String.Format(Resources.InvalidProcName, name, schema));
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ProcedureCacheEntry entry = new ProcedureCacheEntry();
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entry.procedure = proc;
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// we don't use GetSchema here because that would cause another
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// query of procedures and we don't need that since we already
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// know the procedure we care about.
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ISSchemaProvider isp = new ISSchemaProvider(connection);
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string[] rest = isp.CleanRestrictions(restrictions);
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MySqlSchemaCollection parameters = isp.GetProcedureParameters(rest, proc);
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entry.parameters = parameters;
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return entry;
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}
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}
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}
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#endif
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